ACES Publication Search
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| Title: | ACES Journal November 2020 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2194 KB |
| Title: | ACES Journal November 2020 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 7309 KB |
| Title: | ACES Journal November 2020 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 49770 KB |
| Title: | Efficient Jacobian Matrix Determination for H2 Representations of Nonlinear Electrostatic Surface Integral Equations |
| Abstract: | In this paper, a nonlinear electrostatic surface integral equation is presented that is suitable for predicting corrosion-related fields. Nonlinear behavior arises due to electrochemical reactions at polarized surfaces. Hierarchical H2 matrices are used to compress the discretized integral equation for the fast solution of large problems. A technique based on randomized linear algebra is discussed for the efficient computation of the Jacobian matrix required at each iteration of a nonlinear solution. |
| Author(s): | J. Young, R. Adams, S. Gedney |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1303 KB |
| Title: | BLAS IV: A BLAS for Rk Matrix Algebra |
| Abstract: | Basic Linear Algebra Subroutines (BLAS) are well-known low-level workhorse subroutines for linear algebra vector-vector, matrixvector and matrix-matrix operations for full rank matrices. The advent of block low rank (Rk) full wave direct solvers, where most blocks of the system matrix are Rk, an extension to the BLAS III matrix-matrix work horse routine is needed due to the agony of Rk addition. This note outlines the problem of BLAS III for Rk LU and solve operations and then outlines an alternative approach, which we will call BLAS IV. This approach utilizes the thrill of Rk matrix-matrix multiply and uses the Adaptive Cross Approximation (ACA) as a methodology to evaluate sums of Rk terms to circumvent the agony of low rank addition. |
| Author(s): | J. Shaeffer |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1169 KB |
| Title: | Shooting-Bouncing-Rays Technique to Model Mine Tunnels: Theory and Accuracy Validation |
| Abstract: | We present a shooting-bouncing rays technique for electromagnetic modeling of wireless propagation in long tunnels focusing on the accuracy of ray-tracing computation. The examples demonstrate excellent agreement with the traditionally more accurate but less efficient alternative ray-tracing approach using path corrections based on image theory and with a commercial solver. |
| Author(s): | S. Kasdorf, B. Troksa, J. Harmon, C. Key, B. M. Notaros |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1370 KB |
| Title: | Adaptable Nonstandard FDTD Schemes for the Precise Evaluation of Electrostatic Fields |
| Abstract: | The reduction of the total computational overhead in the design of complex geometries, such as modern aircrafts, is a very challenging problem, particularly when electrostatic fields (ESF) for lightning protection, are considered. To this aim, an efficient ESF evaluation scheme, based on the nonstandard finite-difference time-domain (NS-FDTD) method, is proposed. Combining the total-field/scattered-field (TF/SF) concept with a distinct sine-wave form, the novel technique cancels the accumulative errors caused by the static field component. Numerical results reveal that the featured method enables the use of high-frequency discretization models to ESF problems, with notable accuracy and seriously decreased design costs. |
| Author(s): | T. Ohtani, Y. Kanai, N. V. Kantartzis |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1410 KB |
| Title: | Nonlinear Lorentz Model for Explicit Integration of Optical Nonlinearity in FDTD |
| Abstract: | Including optical nonlinearity in FDTD software in a stable, efficient, and rigorous way can be challenging. Traditional methods address this challenge by solving an implicit form of Maxwell’s equations iteratively. Reaching numerical convergence over the entire numerical space at each time step demands significant computational resources, which can be a limiting factor for the modeling of large-scale three-dimensional nonlinear optics problems (complex photonics devices, laser filamentation, ...). Recently, we proposed an explicit methodology based on a nonlinear generalization of the Lorentz dispersion model and developed example cases where it was used to account for both linear and nonlinear optical effects. An overview of this work is proposed here. |
| Author(s): | C. Varin, R. Emms, G. Bart, T. Fennel, T. Brabec |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1138 KB |
| Title: | Height and Angle Characteristics of Point Source Transmitting Power of Wireless Avionics Intra-Communication Systems Based on FDTD Analysis |
| Abstract: | The equivalent isotopically radiated power (EIRP) of a wireless avionics intra-communication (WAIC) system is limited to 6 dBm/MHz at the geometrical center of the aircraft, to avoid interference with aircraft radio altimeters, which are operated at the same frequency band between 4,200– 4,400 MHz. In this paper, the height and angle characteristics of the point source EIRP of a WAIC system are analyzed based on the large scale FDTD analysis. Firstly, the strength of the electric field (E-field) around the three-dimensional model of Airbus A320-200 is analyzed. Then, the point source EIRP is calculated based on the analyzed E-field strength. Finally, the height and angle characteristics are analyzed to estimate the electromagnetic field characteristics of the aircraft. |
| Author(s): | S. Futatsumori, K. Morioka, T. Hikage, T. Sekiguchi, M. Yamamoto, T. Nojima |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1628 KB |
| Title: | Optical Isolation using Compact Time-modulated Cavity Array |
| Abstract: | It is shown using coupled mode theory and verified using finite-difference time-domain simulations how a timemodulated three-cavity array can be designed to allow transmission from port 1 to port 2 but to prevent transmission from port 2 to port 1 thereby implementing optical isolation. The reciprocity of the system is broken by phase-shifting the modulation signal applied to each cavity by 120 degrees which gives the system a synthetic linear momentum. |
| Author(s): | A. Mock |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1395 KB |
| Title: | Composite Materials Development for Fused Filament Fabrication of RF Systems |
| Abstract: | In this paper we present the development of feedstock materials, specifically tailored permittivity materials used in fused filament fabrication (FFF), for microwave applications. One of the major bottlenecks in utilizing additive manufacturing for useful radiofrequency (RF) applications is the lack of suitable materials. Flexible, high-dielectric constant and low dielectric loss tangent composite materials, consisting of a mixture of polymer and ceramic nanoparticles in controlled volume fractions, are manufactured. Effective medium approximations (EMA) to predict composite properties, such as Bruggeman approximations, are validated with measurements between 18 – 40 GHz and are presented. |
| Author(s): | P. Parsons, Z. Larimore, M. Mirotznik, G. Mitchell |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1461 KB |
| Title: | Shape Synthesis of Multi-mode Dielectric Resonator Antennas Using Characteristic Modes |
| Abstract: | This paper demonstrates a shape synthesis technique for multi-mode dielectric resonator antennas using binary genetic algorithm and characteristic mode analysis. The cost function for the synthesis process is defined from characteristic modal parameters, such as modal quality factors and self-resonance frequencies. Since only modal parameters are involved in the cost function, the shape synthesis process is made independent of feeds. In the paper, we demonstrate the shape synthesis of a DRA with three self-resonant modes at 3 GHz. |
| Author(s): | B. Yang, A. Eroglu, J. J. Adams |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1076 KB |
| Title: | Additive Manufacturing of a Dual Band, Hybrid Substrate, and Dual Polarization Antenna |
| Abstract: | We describe the additive manufacturing results pertaining to a multi-function antenna aperture. The antenna consists of customized high dielectric and low loss feedstocks as the enabling technology. The 3D printed prototype shows agreement with simulation while providing excellent performance. |
| Author(s): | G. Mitchell, Z. Larimore, P. Parsons |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1408 KB |
| Title: | Modelling and Impact of 3D Print Inaccuracies on the Performance of Circular Waveguide Hybrid Coupler |
| Abstract: | Circular waveguide hybrid coupler operating over a frequency range of ISM 57-64 GHz, additively printed and metal plated using electroless technique is introduced. Effects of orientation of print and thickness of intricate structures on the performance of circular waveguide hybrid coupler are presented. The structure is printed using commercially available stereolithographic (SLA) printer. Circulatory system operated by a peristaltic pump is used for selective silver deposition of the hybrid coupler. |
| Author(s): | A. Bal, G. H. Huff |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1420 KB |
| Title: | On the Crosstalks between a Pair of Transmission Lines in the Presence of a 3D Printed Electrifi Trace |
| Abstract: | The technology of additive manufacturing results in 3D printing of conductive traces in radio frequency circuits. This creates a plethora of possibilities in realizing flexible and wearable electronics. While the prototypes of microstrip transmission lines and antennas have been recently reported, there is now a need of Electromagnetic Compatibility based study of such 3D printed conductive traces. This paper presents a comparative study on the near end and far end unintentional crosstalk components between a pair of microstrip transmission lines made of Copper in the presence of a 3D printed conductive trace made of a commercially available conductive filament, Electrifi. Any physical contact with the 3D printed trace has been purposefully averted to discard the high contact resistance between the trace and such contacts. |
| Author(s): | D. Mitra, K. S. Kabir, J. Clevelenad, R. Striker, B. D. Braaten, S. Ye, S. Roy |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2150 KB |
| Title: | Calculating Scattering Spectra using Time-domain Modeling of Time-modulated Systems |
| Abstract: | Obtaining agreement between theoretical predictions that assume single-frequency excitation and finite-difference time-domain (FDTD) simulations that employ broadband excitation in the presence of time-varying materials is challenging due to frequency mixing. A simple solution is proposed to reduce artifacts in FDTD-calculated spectra from the frequency mixing induced by harmonic refractive index modulation applicable to scenarios in which second order and higher harmonics are negligible. Advantages of the proposed method are its simplicity and applicability to arbitrary problems including resonant structures. |
| Author(s): | A. Mock |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2146 KB |
| Title: | Complete Radiation Boundary Conditions for Maxwell’s Equations |
| Abstract: | We describe the construction, analysis, and implementation of arbitrary-order local radiation boundary condition sequences for Maxwell’s equations. In particular we use the complete radiation boundary conditions which implicitly apply uniformly accurate exponentially convergent rational approximants to the exact radiation boundary conditions. Numerical experiments for waveguide and free space problems using high- order discontinuous Galerkin spatial discretizations are presented. |
| Author(s): | T. Hagstrom, J. Lagrone |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1031 KB |
| Title: | Wide Band Antenna with Ultra-smooth Spectral Characteristics |
| Abstract: | Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results. |
| Author(s): | A. Raghunathan, B. S. Girish, R. Somashekar, K. S. Srivani, S. Singh, R. Subrahmanyan, N. U. Shankar, M. S. Rao, J. Nambissan T. |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1331 KB |
| Title: | Improvements in Insertion of Auxiliary Parity Segments in WIPL-D All-Quad Meshing Algorithm |
| Abstract: | This paper provides a new technique that improves the all-quad meshing algorithm implemented in the WIPL-D software. The technique allows for the insertion of required auxiliary segments to achieve parity of a number of segments over all closed loops of all faces. The aim of the improvement is to reduce the total number of mesh elements in the final mesh. The efficiency of the proposed technique is compared to the traditional one mentioned earlier. A reduction in the number of mesh elements of about 15% has been achieved when applied to a log-periodic antenna WIPL-D model. |
| Author(s): | B. L. Mrdakovic, B. M. Kolundzija |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1279 KB |
| Title: | Design of Ultra Low Profile Inverted L Antenna Composed of CPW Printed on PET Sheet for IoT Application |
| Abstract: | The ultra low profile inverted L (ULPIL) antenna on a rectangular conducting plane is located above the lower conducting plane and numerically analyzed for the application of IoT. The coplanar waveguide (CPW) is inserted within the antenna element. The antenna element is printed on the polyethylene terephthalate (PET) sheet. The shift of the resonant frequency of this antenna is small due to the existence of lower conducting plane. The influence of the existence of the lower conducting plane can be neglected when the distance between the ULPIL antenna and the lower conducting plane is longer than 6 mm (0.049 wavelength). Therefore the ULPIL antenna may be promising for the IoT application. |
| Author(s): | M. Taguchi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1353 KB |
| Title: | Generation of Radiation Patterns Equivalent to In-Flight Measurements |
| Abstract: | Comparison of in-situ measured antenna radiation patterns (RPs) to modeled ones is vital for validation of both. Inflight measured RPs do not always produce a standard conic or elevation cut (constant θ or ϕ angle, respectively), but rather Great Circle (GC) cuts at the aircraft bank angle of interest. WIPL-D’s post-processing routines, on the other hand, do not produce GC cuts in normal setups. A manipulation of the aircraft orientation in xyz-coordinates is required to accomplish this task. Under standard conditions in WIPL-D, the fuselage is positioned parallel to the x-axis and the wings parallel to the y-axis. A model rotation of 90° with respect to the y-axis allows for the generation of GC cuts, where θ and ϕ swap roles. This makes comparison between in-flight measurements and computed data cumbersome. This paper investigates several options to produce non-standard RPs in WIPL-D and MATLAB (using WIPL-D results) that are equivalent to those of in-flight measurements. |
| Author(s): | R. P. Ortega, L. M. Jugler, Y. Shiri, S. N. Tabet |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1658 KB |
| Title: | Cavity-Backed Dual-Sinuous Antenna Modeling |
| Abstract: | Recently, for Radio Frequency (RF) signal identification on air vehicles, it has become critical to not only be able to detect the direction and angle of arrival of signals, but to also properly identify the polarization of such signals. For decades, cavity-backed dual-spiral antennas were heavily used for this purpose. However, that required the placement of both right-hand and left-hand elements to perform this function. Due to limited space and other issues, an alternative type of broadband antenna had to be identified. The Cavity-Backed Dual-Sinuous (CBDS) antenna makes an excellent replacement for this function. With its elements rotated 45° about its center, each element exhibits slant linear performance. Such an antenna, paired with proper connections and detection hardware, allows the detector to determine the polarization of arriving RF signals. A CBDS antenna was developed in the WIPL-D CEM code. Its RHCP and LHCP performance was studied over a broad range of frequencies. Results did prove that CBDS antennas have excellent broadband performance and polarization extraction. |
| Author(s): | R. P. Ortega, N. M. Christensen, S. N. Tabet |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1753 KB |
| Title: | Rectangular Slot Array Antenna |
| Abstract: | Slot antenna elements are quite popular for use in flat-panel arrays, due to their compactness and relatively large bandwidth. According to Babinet’s Principle, slots and dipoles are duals in performance. Therefore, a vertically placed slot is horizontally polarized and a horizontally placed slot is vertically polarized. A rectangular slot array lends itself to a broad range of applications, e.g., tactical and weather radar. Such arrays can be gimbaled to point their beam in any azimuth and elevation angle of interest. In this effort, a slot antenna element is designed in WIPL-D Pro to operate over the 7.5 - 8.5 GHz frequency range. The element is designed to resonate at 8 GHz. The slot element is used to generate a 6x12 slot array normal to the xy-plane. Separate Taylor tapers (nbar = 5) are applied to the 6-row and 12-column elements to provide 25 dB and 30 dB sidelobe level (SLL) suppression, respectively. The input impedance and pattern performance for a single slot, as well as the slot array’s radiation performance show excellent broadband performance. |
| Author(s): | E. J. Trinidad Garcia, R. P. Ortega, S. N. Tabet |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1832 KB |
| Title: | Isolation Improvement between Closely-Spaced Antennas Using EBG |
| Abstract: | Isolation improvement between two closely spaced antennas using a single column EBG is proposed for compact wireless devices. The proposed design developed for the 2.4 GHz WLAN band achieves more than 17 dB isolation improvement between two planar inverted-F antennas (PIFAs) compared to the no-EBG case. As a result, improved MIMO capacity is also achieved. The proposed design can be scaled up or down in frequency and may be implemented for small devices such as, smart watches, Wi-Fi routers, internet of things (IoT) devices etc. |
| Author(s): | A. H. Abdelgwad, M. Ali |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1526 KB |
| Title: | Non Ideal Cylindrical Monopole Antenna Array |
| Abstract: | This paper presents a study of a Two Monopole Antenna Array. The design takes into account considerations of non sinusoidal current distribution of each monopole antenna approximated by the three term theory developed by King et al. in 1966 and effects of mutual coupling between the two radiating elements. A physical implementation was done to verify the simulated results with good accuracy. |
| Author(s): | C. M. Martinez, E. Aguilera, J. Bonilla-Neira |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1443 KB |
| Title: | Reconfigurable Balanced Dualband Bandstop Filter |
| Abstract: | This paper introduces a novel architecture of reconfigurable balanced (differential) dualband bandstop filter (BSF). In differential mode (DM), each symmetrical bisection of the filter incorporates in-series cascade of two tunable dualband bandstop sections whereas high CMRR is achieved by loading open stubs to the symmetry plane of the branch line structure. To validate the proposed topology, a microstrip prototype is designed and fabricated. Both simulation and measured results show a good agreement with each other. |
| Author(s): | D. Borah, T. S. Kalkur |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1382 KB |
| Title: | Effective Design of Graphene Patch Arrays for Adjustable Plane-Wave Scattering |
| Abstract: | In this paper, the scattering properties of graphene patches are investigated to design arrays that are able to control effectively plane wave propagation. Initially, single patches are examined in terms of their radar cross-section and surface wave generation. Moreover, an array of four identical elements is designed and thoroughly investigated indicating that electrostatic bias field has not a significant effect. However, the application of non-uniform biasing on the same setup reveals the fine adjustment of the scattered wave’s main lobe direction. |
| Author(s): | S. Amanatiadis, T. Ohtani, Y. Kanai, N. Kantartzis |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1079 KB |
| Title: | Circularly Polarized Log Periodic Dipole Antennas |
| Abstract: | This Modified Self-complementary LPDA [1] has a second array of dipoles so arranged that each dipole of the second array has a quarter-wavelength phase difference from that of the corresponding dipole of the standard LPDA array for the given radiation field. The cross-element LPDA does not need a broadband 90-degree hybrid junction to produce circular polarization. |
| Author(s): | H. Kawakami, M. Tanioka, R. Wakabayashi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1441 KB |
| Title: | Side-Frame Dual-Band MIMO Antennas for 5G Smartphone Applications |
| Abstract: | A side-frame dual-band multi-input multioutput (MIMO) antenna system for fifth-generation (5G) mobile communication in smartphone applications is presented, operating in 3.5 GHz band (3400-3600 MHz) and 5 GHz band (4800-5000 MHz). The proposed fourelement antenna array is placed at four corners of the circuit board and printed on the side edge frame. The height of the structure is only 4.1 mm, which is compatible for ultra-thin full screen smartphones. According to the verification of HFSS and CST, ideal impedance matching bandwidths (superior to 10dB) and excellent isolations (superior to 18 dB) are obtained over the 3.5 GHz band and 5 GHz band, with peak gain of 6.18 dB and 4.9 dB, respectively. |
| Author(s): | G. Wei, Q. Feng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1412 KB |
| Title: | Mutual Coupling Compensation in Receiving Antenna Arrays |
| Abstract: | Mutual coupling compensation in uniform linear and circular receiving antenna arrays of thin wire dipoles is presented. It was observed that the mutual impedance is independent of the incident angle and depends solely on the geometry of the array. By using only one measurement, decoupling matrix is computed and direction of arrival is estimated. |
| Author(s): | S. Khan, H. Sajjad, M. K. Ozdemir, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1248 KB |
| Title: | Predicting Electromagnetic Interference to a Terminated Wire Using Characteristic Mode Analysis |
| Abstract: | Electromagnetic coupling to realistic wire configurations exhibit large variations with respect to the frequency, incident angle, and polarization of the interfering signal. In this work, Characteristic Mode Analysis (CMA) is used to calculate the fundamental modes of a terminated wire above an infinite ground plane. Using the properties of the modes, the coupled currents to the wire's loads are predicted for different incident excitations. Using this simple but practical wire configuration, we show the versatility of CMA in practical electromagnetic interference and coupling applications. |
| Author(s): | M. Z. M. Hamdalla, A. N. Caruso, A. M. Hassan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1505 KB |
| Title: | Asymmetric Carbon Nanotube Dimers for Novel Sensing Applications |
| Abstract: | In this work, we study the use of asymmetric carbon nanotube (CNT) dimers for the contactless detection of foreign nano-particles. Asymmetric CNT dimers create a unique field distribution, through the electromagnetic coupling, which in turn generates two distinct resonances representing the bonding and anti-bonding modes. The presence of a foreign nano-particle (NP) in the vicinity of the CNT dimer perturbs the dimer’s field distribution and causes the bonding and antibonding resonances to shift by unequal amounts depending on the NP location. By studying the difference in the shift of the bonding and the anti-bonding resonances, we show that the NP relative location can be reconstructed. The computational experiments performed in this work show how asymmetric CNT dimers can be used for novel sensing applications. |
| Author(s): | S. Dey, A. M. Hassan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1488 KB |
| Title: | Numerical Analysis of an Applicator for Hyperthermia Treatment of Melanoma |
| Abstract: | This document presents the design and validation of an applicator conceived for hyperthermia treatment of the melanoma in the human male torso and female leg. The applicator consists of an antenna array operating in the 5.8GHz ISM band immersed in an interface layer. The resulting device is comfortable to wear by the patient, low-cost and easy to store and handle. Simulation is carried out using Sim4Life and the ViP 3.0 human model, and the results demonstrate correct energy delivery to the tissue under treatment. |
| Author(s): | J. L. Duque Munoz, N. Garcia Ramirez, J. L. Araque Quijano |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1244 KB |
| Title: | On the Report of Performance Analysis of Electrospun Carbon Nanofibers based Strain Sensor for Applications in Human Motion Monitoring |
| Abstract: | Flexible and wearable sensors are currently being extensively used in versatile applications including wireless body area network. Specifically, such sensors are mostly incorporated to yield a linear response within their range of operations. A recently developed flexible and wearable resistive strain sensor made of electrospun carbon nanofibers has been reported with a gauge factor up to 72. In this paper, the performance of the strain sensor embedded in a polyurethane matrix was studied at first. A linear region of operation of such sensor was defined from direct measurements for wireless body area network applications. The equivalent analytical expressions were established and reported. |
| Author(s): | A. Aqueeb, S. Roy, Y. Ding, O. Onyilagha, Z. Zhu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1524 KB |
| Title: | Nonlinear Supra-Electroporation in Realistic Stem Cell Morphologies |
| Abstract: | Exposing cells to ultrashort electric field pulses can lead to the permeabilization of the membranes of the internal cell organelles, such as the nucleus, which is termed as supra-electroporation. In this paper, we study the supraelectroporation of stem cells with realistic morphologies under nanosecond electrical pulse stimulation. For such short pulses, the cell and the nucleus membranes exhibit non-linearity in their conductance. Therefore, we used a non-linear model for the cells’ membranes, coupled with a quasi-static electromagnetic solver, and obtained the solution using a commercial Finite Element Method (FEM) solver. The results show that the outer shape of the cell has a strong effect on the magnitude and the spatiotemporal patterns of the electric field inside the cell, which affects the rate of the supra-electroporation of the nucleus. These variations in the rate of the supra-electroporation of the nucleus can guide the selective targeting of desired cells with specific shapes. |
| Author(s): | S. Baidya, A. M. Hassan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1428 KB |
| Title: | Magnetic Resonance Imaging using Optimized 2D NUFFTs |
| Abstract: | We propose optimized 2D Non-Uniform FFT (NUFFT) algorithms and apply them to Magnetic Resonance Imaging under radial acquisitions. |
| Author(s): | A. Capozzoli, C. Curcio, A. Liseno |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1322 KB |
| Title: | Shooting-Bouncing-Rays Technique to Model Mine Tunnels: Algorithm Acceleration |
| Abstract: | We present and discuss acceleration of a shooting and bouncing rays (SBR) algorithm for ray-tracing electromagnetic analysis of electrically very large structures such as underground mine tunnels at modern wireless communication frequencies. The acceleration is based on the parallelization of the SBR technique on NVIDIA GPUs using the OptiX application programming interface. The results show dramatic speedups of the parallel SBR algorithm compared with serial implementation. |
| Author(s): | S. Kasdorf, B. Troksa, J. Harmon, C. Key, B. M. Notaros |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1297 KB |
| Title: | High Performance Computing in Parallel Electromagnetics Simulation Code suite ACE3P |
| Abstract: | A comprehensive set of parallel finite-element codes suite ACE3P (Advanced Computational Electromagnetics 3D Parallel) is developed by SLAC for multi-physics modeling of particle accelerators running on massively parallel computer platforms for high fidelity and high accuracy simulation. ACE3P enables rapid virtual prototyping of accelerator and RF component design, optimization and analysis. Advanced modeling capabilities have been facilitated by implementations of novel algorithms for numerical solvers. Code performance on state-ofthe- art high performance computing (HPC) platforms for largescale RF modeling in accelerator applications will be presented in this paper. All the simulations have been performed on the supercomputers at National Energy Research Computer Center (NERSC). |
| Author(s): | L. Ge, Z. Li, C.-K. Ng, L. Xiao |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1495 KB |
| Title: | Optimization and Inverse-design Techniques for Metalens Synthesis |
| Abstract: | Phase-gradient metasurfaces enable designers to tailor the behavior of electromagnetic waves at surfaces by exploiting the generalized form of Snell’s law. This ability has led to the investigation of metalenses which have the potential to significantly reduce the size, weight, and power (SWaP) of conventional optical systems. While traditional lenses are made from individual glasses, metalenses are comprised of patterned meta-atom unit cells which are arranged in such a way so as to give the metalens its desired behavior. Therefore, any metalens’s performance is ultimately determined by that of its underlying unit cell components. However, designing meta-atoms that simultaneously achieve high performance over wide frequency bandwidths and fields-of-view is an extremely challenging problem that is best addressed with powerful optimization and inverse-design techniques. |
| Author(s): | S. D. Campbell, E. B. Whiting, R. P. Jenkins, P. L. Werner, D. H. Werner |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1410 KB |
| Title: | Deep Neural Network Inverse-Design for Long Wave Infrared Hyperspectral Imaging |
| Abstract: | This paper presents a deep learning approach for the inverse-design of metal-insulator-metal metasurfaces for hyperspectral imaging applications. Deep neural networks are able to compensate for the complex interactions between electromagnetic waves and metastructures to efficiently produce design solutions that would be difficult to obtain using other methods. Since electromagnetic spectra are sequential in nature, recurrent neural networks are especially suited for relating such spectra to structural parameters. |
| Author(s): | C. Fowler, S. An, B. Zheng, H. Tang, H. Li, W. Guo, H. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1206 KB |
| Title: | Multi-objective Optimization of Linear Proportional Solenoid Actuator |
| Abstract: | This paper employed a multi-objective Genetic Algorithm (GA) process to optimize the structure parameters of Linear Proportional Solenoid (LPS). And designed objectives include magnitude of static push force, stability of push force with displacement in working range and push force to mass ratio. A twodimensional finite element analysis model is presented to reduce the large calculation time generated by GA process. The optimization process result of LPS shape parameters is obtained and the optimal LPS is manufactured. Through using a high-precision measuring device in the static push force test, a comparison result between conventional shape and optimal shape shows that the proposed optimization strategy is feasible. |
| Author(s): | S. J. Wang, Z. D. Weng, B. Jin |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1175 KB |
| Title: | The Design of a Switchable Infrared Hybrid Plasmonic Metasurface Absorber for Energy Harvesting Applications |
| Abstract: | A plasmonic switchable polarizationinsensitive metasurface absorber is proposed. The design provides two modes of operation by employing phasechange material in semiconductor and metallic phases. In this paper, we study the switchable absorption behavior of the metasurface operating in a dual-band and single-band modes targeting the mid-infrared range suitable for energy harvesting applications such as thermophotovoltaics. The design is optimized using a global optimization technique. |
| Author(s): | A. S. Negm, M. H. Bakr, M. M. Howlader, S. M. Ali |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1179 KB |
| Title: | Nonlinear Schrödinger Equation-Based Adjoint Sensitivity Analysis |
| Abstract: | A general nonlinear adjoint sensitivity analysis (ASA) approach for the time-dependent nonlinear Schrödinger equation (NLSE) is presented. The proposed algorithm estimates the sensitivities of a desired objective function with respect to all design parameters using only one extra adjoint system simulation. The approach efficiency is shown here through a numerical example. |
| Author(s): | M. M. T. Maghrabi, M. H. Bakr, S. Kumar |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1290 KB |
| Title: | Nested Kriging Surrogates for Rapid Multi-Objective Optimization of Compact Microwave Components |
| Abstract: | A procedure for rapid EM-based multi-objective optimization of compact microwave components is presented. Our methodology employs a recently developed nested kriging modelling to identify the search space region containing the Pareto-optimal designs, and to construct a fast surrogate model. The latter permits determination of the initial Pareto set, further refined using a separate surrogate-assisted process. As an illustration, a three-section impedance transformer is designed for the best matching and minimum size. The set of trade-off designs is produced at the low computational cost of only a few hundred of high-fidelity EM simulations of the transformer circuit despite a large number of its geometry parameters. |
| Author(s): | A. Pietrenko-Dabrowska, S. Koziel |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1487 KB |
| Title: | Low-Cost Surrogate Modeling of Miniaturized Microwave Components Using Nested Kriging |
| Abstract: | In the paper, a recently reported nested kriging methodology is employed for modeling of miniaturized microwave components. The approach is based on identifying the parameter space region that contains high-quality designs, and, subsequently, rendering the surrogate in this subset. The results obtained for a miniaturized unequal-power-split rat-race coupler and a compact three-section impedance transformer demonstrate reliability of the method even for highly-dimensional parameter spaces, as well as its superiority over conventional modeling methods. |
| Author(s): | A. Pietrenko-Dabrowska, S. Koziel |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1703 KB |
| Title: | Fast Antenna Optimization Using Gradient Monitoring and Variable-Fidelity EM Models |
| Abstract: | Accelerated simulation-driven design optimization of antenna structures is proposed. Variable-fidelity electromagnetic (EM) analysis is used as well as the trust-region framework with limited sensitivity updates. The latter are controlled by monitoring the changes of the antenna response gradients. Our methodology is verified using three compact wideband antennas. Comprehensive benchmarking demonstrates its superiority over both conventional and surrogate-assisted algorithms. |
| Author(s): | S. Koziel, A. Pietrenko-Dabrowska |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1661 KB |
| Title: | Fast and Intelligent Antenna Design Optimization using Machine Learning |
| Abstract: | Traditional antenna optimization solves the modified version of the original antenna design for each iteration. Thus, the total time required to optimize a given antenna design is highly dependent on the convergence criteria of the selected algorithm and the time taken for each iteration. The use of machine learning enables the antenna designer to generate trained mathematical model that replicates the original antenna design and then apply optimization on the trained model. Use of trained model allows to run thousands of optimization iterations in a span of few seconds. |
| Author(s): | G. Gampala, C. J. Reddy |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1399 KB |
| Title: | Systematic CMA of the U-slot Patch with FEKO |
| Abstract: | Since its introduction 25 years ago, the probe-fed Uslot patch antenna has remained popular. Recently, Characteristic Mode Analysis (CMA) revealed these devices are governed by Coupled Mode Theory (CMT). Although this principle is conceptually simple, achieving this understanding is only possible through a systematic analysis using CMA. This paper uses the Uslot patch to illustrate a general process for analyzing electrically small antennas using CMA with the software package FEKO. |
| Author(s): | J. J. Borchardt |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1615 KB |
| Title: | New Features in Feko and WinProp 2019 |
| Abstract: | This paper describes some of the latest features in the commercial electromagnetic software Feko (including WinProp). These include the modeling of non-ideal cable shield connections, the parallel direct adaptive cross approximation (ACA) solver, edge and wedge diffraction for the ray launching geometrical optics (RL-GO) solver, and several new features related to automotive radar. |
| Author(s): | M. Schoeman, R. Marchand, J. van Tonder, U. Jakobus, A. Aguilar, K. Longtin, M. Vogel, T. Alwajeeh |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1102 KB |
| Title: | Simultaneous Transmit and Receive with Shared-Aperture Arrays |
| Abstract: | An approach based on shared aperture antenna array is researched for simultaneous transmit and receive (STAR) applications. The proposed configuration is a 10×10 antenna array of circularly-polarized (CP) elements with 50 elements, somewhat sparsely distributed, dedicated for Tx while the remaining elements dedicated for Rx. The high isolation is achieved between Tx and Rx elements at the expense of higher sidelobe levels, which is an inherent property of sparse antenna arrays. To demonstrate the performance of the proposed STAR configuration, numerical modelling is conducted using multilevel fast multipole method (MLFMM) solver in Altair FEKO. |
| Author(s): | A. Samaiyar, D.-C. Son, M. A. Elmansouri, D. S. Filipovic |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1845 KB |
| Title: | FEKO™ Simulation of Radar Scattering from Objects in Low Earth Orbit for ISAR Imaging |
| Abstract: | Objects in low earth orbit such as CubeSats and the International Space Station (ISS) move with constant velocity along a linear trajectory when viewed from a ground-based radar. The small change in attitude of the object as it flies overhead permits the generation of an inverse synthetic aperture radar (ISAR) image. In this paper, Altair’s FEKO™ software is used to model the monostatic radar scattering from the ISS as a function of frequency and aspect angle. The computed data is used for generating a simulated ISAR image from a ground-based radar. The system design requirements for the radar are calculated from the radar equation. |
| Author(s): | A. Brandewie, R. J. Burkholder |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1379 KB |
| Title: | Open-Source Antenna Pattern Validation using FEKO |
| Abstract: | An open-source antenna pattern measurement system comprised of software-defined radios (SDRs), standard PVC tubing, and 3-D printer components measures the radiation patterns of student-built prototype antennas. Position control is realized using an Arduino microcontroller. Measured principal plane gain patterns for two antenna prototypes are compared to (FEKO) simulated results. The low-cost, open-source nature of the measurement system is ideal for undergraduate-level investigation of antenna theory and measurement. |
| Author(s): | C. W. Hearn |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1410 KB |
| Title: | Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground |
| Abstract: | This paper compares the theoretical and measured antenna patterns of a slant 45-degree antenna on a rolled edge ground plane. Advantages of using sampled nearfield currents in combination with large element physical optics in determining the reflected far fields will be described. |
| Author(s): | K. Snyder |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1397 KB |
| Title: | Beyond LOS Detection of Hypersonic Vehicles |
| Abstract: | RCS modeling of a typical hypersonic vehicle and its plasma sheath was investigated. The plasma parameters were analyzed to determine which were most dominant for accurate RCS prediction. HF was determined to provide BLOS detection and good conductivity of the plasma, for optimum RCS. |
| Author(s): | R. L. Musselman, S. H. Chastain |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1402 KB |
| Title: | Electromagnetic Susceptibility of COTS Control Systems |
| Abstract: | COTS control systems used on small UAVs were investigated for EMC vulnerabilities. Electronic speed controllers, autopilots, and inertial measurement units were electromagnetically disrupted, by modulating RF signals with waveforms that were rectified by nonlinearities. These disruptions had catastrophic effects on the functionality of the devices, without physically damaging them. |
| Author(s): | R. L. Musselman, B. J. Neff |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1497 KB |
| Title: | Optimal Range of Coupling Coefficient of Loosely Coupled Transformer Considering System Resistance |
| Abstract: | Accurate system resistance may lead to an obvious error between the simulated and the real efficiency of the system. This paper proposes an optimal range of coupling coefficient for ensuring the efficiency and the sufficient output power of the WPT (wireless power transfer) system. A 3-kW prototype WPT system is manufactured and the effectiveness of the optimal range of coupling coefficient is validated. |
| Author(s): | J. Ge, H. H. Eldeeb, K. Liu, J. Kang, H. Zhao, O. Mohammed |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1477 KB |
| Title: | Effect of Stator Insulation Failure on the Motor Drive System Performance |
| Abstract: | This study investigates the influence of the stator’s turnto- turn failures (TTFs) on the electromagnetic (EM) fields, such as air gap flux density, flux density in the stator, and rotor iron core inside of direct self-control (DSC) driven induction machines (IMs). The purpose of the investigation is to capture the fault signatures in the air gap EM flux for detecting the stator’s fault at its embryonic stage. |
| Author(s): | H. H. Eldeeb, H. Zhao, O. Mohammed |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1166 KB |
| Title: | Taguchi-EM-AI Design Optimization Environment for SynRM Drives in Traction Applications |
| Abstract: | Multi-objective design optimization environments are used for electric vehicles and other traction applications to arrive at efficient motor drives. Typically, the environment includes characterization modules that involve the use of Electromagnetic Finite Element and State-Space models that require large number of iterations and computational time. This work proposes the utilization of a Taguchi orthogonal arrays method in conjunction with a Particle Swarm Optimization search algorithm to reduce computational time needed in the design optimization of electric motors for traction applications. The effectiveness of the Taguchi method in conjunction with the optimization environment is demonstrated in a case study involving a prototype of a Synchronous Reluctance Motor drive system. |
| Author(s): | A. A. Arkadan, N. Al Aawar |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1102 KB |
| Title: | Mixed-Mode Effect on Motor Common Mode Current |
| Abstract: | This paper presents the mixed-mode effect on motor common mode current (CMC) in an adjustable speed drive (ASD). It is expected that the motor CMC is lower than inverter output CMC. However, the measurement result of the ASD shows that the AC motor input CMC is higher than the inverter output CMC in a frequency range. By using a mixed-mode (MM) 6-port networks, it is proven that the AC motor input CMC is higher due to an MM CMC which is generated from differential mode current. |
| Author(s): | V. Karakasli, G. Griepentrog, J. Wei, D. Drozhzhin |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1352 KB |
| Title: | Numerical Analysis of the Corrosion of Buried Pipes near High Voltage Transmission Lines |
| Abstract: | We present the multi-physical analysis of the induction-corrosion process undergone by a buried pipe subject to electromagnetic induction from a nearby High Voltage Transmission Line (HVTL). The scenario analyzed models a typical situation found in Colombia by using realistic characteristics of the pipe, the HVTL, and environmental parameters such as soil resistivity. The results presented provide a quantitative view of the corrosion process and constitute a useful tool for the analysis and design of the increasingly common situation of pipelines running near HVTLs. |
| Author(s): | D. M. Arango Angarita, D. Vargas Medina, J. L. Araque Quijano |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1287 KB |
| Title: | Resonant Characteristics of Split Ring Resonator and Unit Cell for Periodic Metamaterial Devices |
| Abstract: | The resonant characteristics of single split ring resonator-based metamaterial devices with single gap are presented using the analytical formulation developed for the lumped element equivalent circuit model. The characteristics of the metamaterial resonators have been investigated for different ring sizes, gap widths and substrate permittivity. Equivalent circuit model is developed for two ring structures. The analytical, and simulation results are compared and verified. The prototype has been then built and measured. It has been observed that all the results agree. The results presented in this paper can be used to develop devices at the THz range that can operate as sensors, antennas or tuning elements. |
| Author(s): | B. Chowdhury, T. Walpita, B. Yang, A. Eroglu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1489 KB |
| Title: | A High Gain Lens-Coupled On-Chip Antenna Module for Miniature-Sized Millimeter-Wave Wireless Transceivers |
| Abstract: | This paper presents high gain and compact Transmit/Receive (TX/RX) integrated antennas in a standard BiCMOS 130nm technology for millimeter-scale millimeter-wave (mm-wave) applications, including high data rate radios and high resolution radars. The proposed TX/RX antenna module utilizes an integrated dipole antenna for the receiver and a slot antenna for the transmitter, placed orthogonally. The achieved gain and radiation efficiency are 5.7dBi and 41.3% for the slot antenna, respectively, and 6dBi and 39% for the dipole antenna. The link budget is improved by 16dB by optimization on the geometry as well as application of a high resistivity hemispheric silicon dielectric lens. |
| Author(s): | M. Moosavifar, D. Wentzloff |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1640 KB |
| Title: | Non-physical Impedance Matching |
| Abstract: | Non-physical matching (NPM) is a method for transforming the impedance of a CEM modeled device into a target impedance using algebraic methods. NPM is a useful tool for replicating existing devices in CEM models. |
| Author(s): | W. D. May |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1344 KB |
| Title: | Localization of a Discharge in Transmission Line Networks using Time Reversal with TLM |
| Abstract: | The location of an electrical discharge in a transmission line network is found from its recorded transient response by means of a time reversal simulation. The accuracy of the localization procedure depends on how closely the simulator models the wave properties of the network that must be linear, reciprocal, and virtually loss-free. TLM simulations are presented. |
| Author(s): | W. J. R. Hoefer |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1274 KB |
| Title: | The Diffraction by the Half-plane with the Fractional Boundary Condition |
| Abstract: | In this article, there is considered the electromagnetic plane wave diffraction by the half-plane with fractional boundary conditions. As a mathematical tool, the fractional calculus is used. The theoretical part is given based on which the near field, Poynting vector and energy density distribution are calculated. Interesting results are obtained for the fractional order between marginal values, which describes a new type of material with new properties. The results are analyzed. |
| Author(s): | V. Tabatadze, E. Veliyev, E. Karacuha, K. Karacuha |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1593 KB |
| Title: | Nonlocal Hydrodynamic Models for the Optical Response of Plasmonic Nanostructures |
| Abstract: | In order to model the interaction between light and plasmonic structures at deep-nanometer scale, which is governed by non-classical effects, a nonlocal hydrodynamic approach has been extensively studied. Several hydrodynamic models have been proposed, solving the coupled equations: the linearized hydrodynamic equation of motion and the electrodynamic Maxwell’s equations, by employing additional boundary conditions. This work compares four hydrodynamic models: the hard wall hydrodynamic model (HW-HDM), the curl-free hydrodynamic model (CF-HDM), the shear forces hydrodynamic model (SF-HDM), and the quantum hydrodynamic model (Q-HDM). The analysis is conducted for a metallic spherical nanoparticle, as an example. The above hydrodynamic models are also compared with experiments available in literature. It is demonstrated that HW-HDM and QHDM outperform the other two hydrodynamic models. |
| Author(s): | M. Kupresak, X. Zheng, G. A. E. Vandenbosch, V. V. Moshchalkov |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1300 KB |
| Title: | Microwave Non-Destructive Testing Technique for Material Characterization of Concrete Structures via Electromagnetic Waves with FDTD |
| Abstract: | Concrete is a nonhomogeneous medium that contains coarse aggregate, sand (fine aggregate), cement powder, water and porosity. Microwave non-destructive testing (NDT) technique is used to simulate three layered media that contains air gap, coarse aggregate and a two layered media that contain rebar and void is modeled as closest to the reality. Interaction of electromagnetic wave and the concrete pile is utilized for numerical simulation. A Finite-Difference Time-Domain (FDTD) method with Perfectly Matched Layer (PML) Absorbing Boundary Condition (ABC) is proposed to simulate electromagnetic wave propagation in FRP tube and composite pile. 2D simulation of a wave generated from a point source at microwave frequencies is obtained by using MATLAB®. |
| Author(s): | U. S. Sener, S. Eker |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1338 KB |
| Title: | Compressing H2 Matrices for Translationally Invariant Kernels |
| Abstract: | H2 matrices provide compressed representations of the matrices obtained when discretizing surface and volume integral equations. The memory costs associated with storing H2 matrices for static and low-frequency applications are O(N). However, when the H2 representation is constructed using sparse samples of the underlying matrix, the translation matrices in the H2 representation do not preserve any translational invariance present in the underlying kernel. In some cases, this can result in an H2 representation with relatively large memory requirements. This paper outlines a method to compress an existing H2 matrix by constructing a translationally invariant H2 matrix from it. Numerical examples demonstrate that the resulting representation can provide significant memory savings. |
| Author(s): | R. J. Adams, J. C. Young, S. D. Gedney |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1693 KB |
| Title: | Computational Performance of MATLAB and Python for Electromagnetic Applications |
| Abstract: | MATLAB and Python are two commonly used scripting languages for prototyping electromagnetic problems today. Each of these languages provides access to computationally efficient functions allowing a user to easily run many math heavy problems with minimal programming. In this paper we will discuss the usage of MATLAB and a variety of libraries in Python capable of running these efficient computations. Tests will be run in both languages to compare both CPU and GPU computations. The runtimes of a variety of problems using each of these platforms will also be compared for a variety of mathematical operations typically used in electromagnetic problems. Finally, a simple angle of arrival calculation using conventional beamforming will be performed to show these speeds on a realistic problem. |
| Author(s): | A. Weiss, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1387 KB |
| Title: | IMPATT Efficiency Extraction Using On-Chip Antenna Radiation |
| Abstract: | IMPATT diodes were designed and integrated with microstrip patch antenna on–chip in standard CMOS technology to extract the efficiency beyond avalanche frequency. By comparing the on-chip simulations and measurements of an IMPATT diode integrated in a CPW to an integrated one with a microstrip patch antenna at the same biasing conditions, the results demonstrated an efficiency ranging from ~ 0.01% to 0.016% without and with the added surface roughness losses, respectively. Such variation is strongly associated with the uncertainty provided by the increase of conduction losses ranging between 40%~80% beyond the avalanche frequency. |
| Author(s): | T. Al-Attar |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1421 KB |
| Title: | Comparison of Different Ways of Extra Phosphorus Implantation Which Decrease the Threshold Voltage and On-resistance of UMOS |
| Abstract: | A method to decrease the threshold voltage and on-resistance is discussed in this paper, which is adding extra phosphorus implantation into silicon. There are two ways to implant extra phosphorus without adding a mask. The first way is to implant extra phosphorus after the field oxide etching, and the second way is to implant extra phosphorus with the source region mask before the N+ implantation. Compare the results of the two ways to find their characteristics and choose the appropriate one. |
| Author(s): | X. Zhou, Q. Y. Feng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1212 KB |
| Title: | 3D Electromagnetic Particle-in-Cell Simulation of EMP Generated by Pulsed X-rays |
| Abstract: | Pulsed X-rays could cause significant cavity system-generated electromagnetic pulse (SGEMP) interference. A 3D electromagnetic particle-in-cell simulation approach is developed to calculate EMP generated inside a cylindrical cavity after X-ray illumination. The waveform, spatial distributions and resonant frequencies of cavity SGEMP are demonstrated by the computations. The peak value of cavity SGEMP main pulse is 72.88 kV/m. When farther away from the charge emitting face, the field strength decreases quickly and its polarity reverses; when the distance from symmetry axis increases, the field strength declines relatively slower. The cavity SGEMP would form a stable resonance and its frequency is dominated by the radius and length of cavity. The simulation method is verified and can be applied to the X-ray radiation hardness. |
| Author(s): | Z. Xu, C. Meng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1291 KB |
| Title: | Thermal Simulation of a Conductive Fabric Sheet Subjected to a Lightning-like Current |
| Abstract: | A sample of electroconductive fabric subjected to a lightning-like current impulse is analyzed in this contribution. A multiphysics simulation is used to calculate the temperature distribution produced by a lightning-like current flowing through the material sample. A decoupled, electromagnetic (EM) and thermal, simulation was conducted for the analysis and is explained in the paper. The scaling factor calculation to represent the energy presented during current impulse tests is also detailed. Numerical results present patterns that agree with experimental tests reported in the literature and represent an additional tool for the phenomena insight. |
| Author(s): | J. J. Pantoja, C. Rivera, J. Cristancho, J. Rodriguez, F. Roman |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1369 KB |
| Title: | Use of Dielectric Spectroscopy for the Study of Concentration of Glyphosate in Distilled Water |
| Abstract: | In this paper, the capability of sensing low concentrations of glyphosate in water of two interdigital capacitive transducers are analyzed using numerical simulations and measurements. Each microwave sensor is analyzed using the surface electric field produced at the resonance frequency. In addition, the reflection coefficient of each transducer submerged in water with glyphosate is measured and compared with distilled water. Prepared samples with concentrations of 1ppm/L (1 part per million over a liter of distilled water) are used for the experimental tests. |
| Author(s): | C. Mendivelso, J. J. Pantoja, F. Vega, C. Kasmi, F. Al Yafei |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1454 KB |
| Title: | A Comparison of Error Estimators for Method of Moments |
| Abstract: | Local error estimators are investigated for use with numerical solutions of the electric field integral equation. Threedimensional test targets include a sphere, disk, NASA almond, and a Lockheed Martin Expedite aircraft model. Visual plots and correlation coefficients are used to assess the accuracy of the estimators. It is shown that the inexpensive discontinuity estimators are usually as accurate as the residual method. |
| Author(s): | C. Braddock, A. Peterson |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1536 KB |
| Title: | Adding a Reproducible Airplane Model to the Austin RCS Benchmark Suite |
| Abstract: | A full-size airplane model (the EXPEDITE-RCS model) was developed as part of a benchmark suite for evaluating radarcross- section (RCS) prediction methods. To generate accurate reference data for the benchmark problems formulated using the model, scale-model targets were additively manufactured, their material properties and RCS were measured, and the measurements were validated with a surface-integral-equation solver. To enable benchmarking of as many computational methods as possible, the following data are made available in a version-controlled online repository: (1) Exterior surface (outer mold line) of the CAD model in two standard file formats. (2) Triangular surface meshes. (3) Measured and predicted monostatic RCS data. |
| Author(s): | J. T. Kelley, A. Maicke, D. A. Chamulak, C. C. Courtney , A. E. Yilmaz |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1343 KB |
| Title: | Benchmark of Acceleware vs XFdtd for Field Simulations of Microstrip Patch Antenna |
| Abstract: | We benchmark the accuracy and the speed of the Acceleware FDTD library vs XFdtd in simulating a microstrip patch antenna. The benchmark is based on the sampled electric and magnetic fields. The results show that Acceleware performs almost three times faster than XFdtd. The relative mean error is less than 2.0%. |
| Author(s): | T. Kamucheka, Z. Gui, M. Huang, H. Churchill, M. El-Shenawee |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1482 KB |
| Title: | On the Accuracy of Flexible Antennas Simulations |
| Abstract: | The performance of wearable and flexible antennas can be greatly affected by bending and crumpling. While these effects have been studied in the literature, the accuracy of simulation in these conditions should be considered. In this paper, the effects of accurate modeling of the excitation, and the supporting structures are investigated. |
| Author(s): | S. Noghanian, M. Griesi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1537 KB |
| Title: | Design of Dual-Polarized Pyramidal Log-Periodic Antenna with Integrated Feed for Additive Manufacturing |
| Abstract: | A dual-polarized log-periodic antenna with 5:1 bandwidth is considered for wideband, amplitude only directionfinding applications. The proposed system is comprised of two identical, orthogonal, sets of trapezoidal log-periodic arms. The arms’ inclination from planar facilitates reduced back lobe radiation to improve directivity and efficiency once absorber is introduced. One arm of each polarization set contains a variable radius coaxial shell to achieve impedance matching such that the system impedance at the base of the antenna is matched to 50 ohms. Analysis and design for the 3d printed direction-finding antenna system is accomplished using a commercial off the shelf (COTS) finite element method (FEM) solver. |
| Author(s): | G. R. Friedrichs, J. A. Cazden, D. S. Filipovic |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1678 KB |
| Title: | A Thick Origami Traveling Wave Antenna |
| Abstract: | This paper presents a thick origami foldable traveling wave antenna. A typical microstrip rampart-line antenna is appropriately modified to enable folding/unfolding capability using a surrogate hinge. This antenna is designed on a 1:5 mmthick FR4 substrate circularly polarized at 3:4 GHz and exhibits a peak gain of approximately 2:85 dB at broadside. |
| Author(s): | G. P. Carrara, M. Hamza, C. L. Zekios, S. V. Georgakopoulos |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1171 KB |
| Title: | Arrow Patch-Slot Antenna for 5G Lower Frequency Band Communications |
| Abstract: | A compact size arrow shaped patch in a rectangular slot antenna is designed for 5G communications in the lower 3 to 6 GHz band. The antenna element is fed through a coplanar waveguide with partial ground plane for better impedance matching with 50 Ohms across the entire band. The maximum gain of a single element is 3.8 dB at 3.7 GHz, while for linear arrays of 5 and 15 elements with uniform excitation the maximum gains are 10.9 dB and 16 dB, respectively. The 5 and 15 elements arrays provide scanning range with no significant degradation of the main beam up to 30˚ and 45˚, respectively. The properties of this antenna element makes it suitable for 5G wireless mobile devices and miniaturized base stations antenna arrays. |
| Author(s): | Y. Feng, Y. Chen, A. Z. Elsherbeni, K. Alharbi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1451 KB |
| Title: | Implementation of Passive and Active Circuit Elements in Cylindrical Finite-Difference Time-Domain Formulation |
| Abstract: | The implementation of passive and active linear circuit elements in cylindrical finite-difference time-domain technique (CFDTD) is developed. The updating equations for active element such as a voltage sources and passive elements such as resistors, capacitors and inductors are represented for elements located along one of the cylindrical coordinate’s independent parameters. The analytical solutions for simple circuit configurations are computed and used as a reference to verify and confirm the accuracy of the developed CFDTD formulation and numerical results. |
| Author(s): | A. M. Algarni, A. Z. Elsherbeni, M. Hadi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1555 KB |
| Title: | A Practical Fourth Order Finite-Difference Time-Domain Algorithm for the Solution of Maxwell’s Equations |
| Abstract: | Implementing a practical fourth order accurate in time and second order accurate in space finite difference time domain simulation using MATLAB is the goal of this paper. The formulation presented for the fourth order approximation is simple to integrate into an existing second order accurate in time and second order accurate in space formulation and wellestablished code. The fourth order formulation has been verified and simulation accuracy is confirmed through the application of radiation from a single and an array of dipole antennas. |
| Author(s): | A. P. Thomson, A. Z. Elsherbeni, M. Hadi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1621 KB |
| Title: | Debye Coefficients for Biological Tissues From 100 MHz to 100 GHz |
| Abstract: | Debye modeling of dispersive, biological tissues allows for the numerical analysis of electromagnetic waves in the vicinity of a human body using the FDTD method. Three-term Debye expansion coefficients for 55 human biological tissues are determined via a two-step numerical solver. The Debye coefficients obtained predict precisely the complex permittivity of the experimentally available tissue data. |
| Author(s): | R. Lumnitzer, A. Tanner, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1326 KB |
| Title: | Simulation of a Nonlinear Frequency Multiplier using the FDTD Technique |
| Abstract: | Nonlinear circuits are a key component in RF transceivers. Efficiency and power requirements for 5G communication are creating new challenges in simulation and modeling of nonlinear devices. An application of the finitedifference time-domain (FDTD) method to nonlinear circuits comprising diodes is demonstrated. A frequency multiplier is constructed from a diode and a low-pass filter. The diode is simulated in the context of this circuit to demonstrate the formation of harmonics. |
| Author(s): | J. M. Kast, A. Z. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1628 KB |
| Title: | Quantifying Sub-gridding Errors in Standard and Hybrid Higher Order 2D FDTD Simulations |
| Abstract: | Sub-gridding errors for a 2D Finite-Difference Time-Domain (FDTD) simulation are compared for both the standard FDTD and Hybrid higher order FDTD cases. Subgridding contrast ratios of 1:3, 1:9, 1:15, and 1:27 are considered and analyzed. A correlation is seen between the increase of contrast ratio with the increase of sub-gridding errors for both standard and hybrid cases. However, a trend of errors reduction when using hybrid formulations over standard formulations is apparent for each contrast ratio. |
| Author(s): | M. Le, M. Hadi, A. Elsherbeni |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1357 KB |
| Title: | Quantum Monopulse Radar |
| Abstract: | We evaluate the feasibility of a quantum monopulse radar, focusing on quantum illumination (QI) radars and quantum two-mode squeezing (QTMS) radars. Based on their similarity with noise radar, for which monopulse operation is known to be possible, we find that QTMS radars can be adapted into monopulse radars, but QI radars cannot. We conclude that quantum monopulse radars are feasible. |
| Author(s): | D. Luong, S. Rajan, B. Balaji |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1082 KB |
| Title: | Mutual Coupling Compensation in Receiving Arrays and Its Implementation on Software Defined Radios |
| Abstract: | Mutual coupling is compensated in a four element uniform linear receiving array using software defined radios. Direction of arrival (DoA) is estimated in real-time for the array with spacing d=λ/4. The decoupling matrix was measured using a VNA for only one incident angle. After compensation the error in DoA estimation was reduced to 5%. Comparing the DoA results with d=λ/2 spaced Uniform Linear Array (ULA), 1:2% error was observed. Although, the experiment was performed indoors with a low SNR, the results show a substantial improvement in the estimated DoA after compensation. |
| Author(s): | S. Khan, H. Sajjad, M. K. Ozdemir, E. Arvas |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2784 KB |
| Title: | Effect of Sparse Array Geometry on Estimation of Co-array Signal Subspace |
| Abstract: | This paper considers the effect of sparse array geometry on the co-array signal subspace estimation error for Direction-of-Arrival (DOA) estimation. The second largest singular value of the signal covariance matrix plays an important role in controlling the distance between the true subspace and its estimate. For a special case of two closely-spaced sources impinging on the array, we explicitly compute the second largest singular value of the signal covariance matrix and show that it can be significantly larger for a nested array when compared against a uniform linear array with same number of sensors. |
| Author(s): | M. C. Hucumenoglu, P. Pal |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1170 KB |
| Title: | Ground Penetrating Radar Radargram Filter using Singularity Expansion Method |
| Abstract: | In this paper, the singularity expansion method (SEM) is used to improve the signal-to-clutter ratio of radargrams obtained with a ground penetration radar (GPR). SEM allows to select the poles of the GPR signals corresponding to unwanted signals, clutter, and also reflections of specific buried objects. A highly reflective metallic material was used to assess the use of SEM as a tool to eliminate unwanted reflections and signals produced by a GPR. Selected clutter poles are eliminated from each frame of the SAR image in order to keep only desired poles for analysis. Finally, the reconstructed radargram obtained applying SEM is compared with the image obtained using a well-known processing technique. Results show that the proposed technique can be used to straightforwardly remove undesired signals measured with GPRs. |
| Author(s): | E. F. Ruiz, D. Chaparro-Arce, J. J. Pantoja, F. Vega, C. Kasmiv, F. Al Yafei |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1169 KB |
| Title: | DOA Estimation in Heteroscedastic Noise with sparse Bayesian Learning |
| Abstract: | We consider direction of arrival (DOA) estimation from long-term observations in a noisy environment. In such an environment the noise source might evolve, causing the stationary models to fail. Therefore a heteroscedastic Gaussian noise model is introduced where the variance can vary across observations and sensors. The source amplitudes are assumed independent zero-mean complex Gaussian distributed with unknown variances (i.e., source powers), leading to stochastic maximum likelihood (ML) DOA estimation. The DOAs are estimated from multisnapshot array data using sparse Bayesian learning (SBL) where the noise is estimated across both sensors and snapshots. |
| Author(s): | P. Gerstoft, C. F. Mecklenbrauker, S. Nannuru, G. Leus |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1392 KB |
| Title: | Synthesizing High-performance Reconfigurable Meta-devices through Multi-objective Optimization |
| Abstract: | Metasurfaces offer the potential to realize large SWaP (size, weight, and power) reduction over conventional optical elements for their ability to achieve comparable functionalities in ultrathin geometries. Moreover, metasurfaces designed with phase change materials offer the potential to go beyond what is achievable by conventional optics by enabling multiple functionalities in a single reconfigurable meta-device. However, designing a single metasurface geometry that simultaneously achieves multiple desired functionalities while meeting all bandwidth requirements and fabrication constraints is a very challenging problem. Fortunately, this challenge can be overcome by the use of state-of-the-art multi-objective optimization algorithms which are well-suited for the inverse-design of multifunctional meta-devices. |
| Author(s): | S. D. Campbell, Y. Wu, E. B. Whiting, L. Kang, P. L. Werner, D. H. Werner |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1323 KB |
| Title: | Time-modulated Coupled-cavity System for Optical Switching |
| Abstract: | The scattering parameters of a time-modulated twocoupled- cavity system are obtained using coupled mode theory and verified using the finite-difference time-domain method. We find that a suitably tailored time-modulation of the cavities allows for switching the output on and off. The proposed functionality can be used in direct amplitude modulation of an optical carrier from a frequency-modulated RF message. |
| Author(s): | A. Mock |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1304 KB |
| Title: | Reconfigurable All Dielectric Metasurfaces based on Optical Phase Change Materials: Design Approaches |
| Abstract: | Optical metasurface is a recently emerged paradigm for controlling light propagation, which enables implementation of ultra-compact optical devices with extended functionalities. Nowadays the main challenge in the field is to realize active metasurfaces with high quality, high efficiency, and large tuning range. Here we present a design approach for constructing a twostate reconfigurable metalens made of low-loss optical phasechange material (O-PCM). The metalens design is capable to produce diffraction limited focusing, large change in focal length (from 1.5 mm to 2mm), and decent focusing efficiency of about 20% in both states. The proposed design methodology is generic and can be easily extended towards constructing metasurfaces, which can switch between two or more arbitrary phase maps. |
| Author(s): | M. Y. Shalaginov, S. An, Y. Zhang, F. Yang, C. Fowler, H. Zhang, J. Hu, T. Gu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1861 KB |
| Title: | Artificial Synapse with Mnemonic Functionality using GSST-based Photonic Integrated Memory |
| Abstract: | Here we present a multi-level discrete-state nonvolatile photonic memory based on an ultra-compact (<4μm) hybrid phase change material GSST-silicon Mach Zehnder modulator, with low insertion losses (3dB), to serve as node in a photonic neural network. Emulating an opportunely trained 100 × 100 fully connected multilayered perceptron neural network with this weighting functionality embedded as photonic memory, shows up to 92% inference accuracy and robustness towards noise when performing predictions of unseen data. |
| Author(s): | M. Miscuglio, J. Meng, A. Mehrabian, V. J. Sorger, O. Yesiliurt, L. J. Prokopeva, A. V. Kildishev, Y. Zhang, J. Hu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1837 KB |
| Title: | Two-dimensional Wireless Power Relay Plane based on Rectangular Switchable Units |
| Abstract: | In this paper a two-dimensional wireless relay plane consists of square resonant units is proposed. Power transfer between the transmitting coil and receiver above any unit can be achieved by resonance through the shortest routes on the plane. The self-resonant frequencies of units on the planned route are adjusted to be identical for efficient power transfer, while units beyond the route are isolated from power exchange due to frequency shift. Full wave electromagnetic simulation is executed and analyzed. According to the simulation results, concentrated power transfer can be realized on the power relay plane, and the highest transmission efficiency is 73.93%. |
| Author(s): | Z. Wu, P. Lin, C. Ma, Z. Tang, R. Li, J. Huangfu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1276 KB |
| Title: | Frequency-Selective Planar Coil Architecture Modeling for WPT Access Control |
| Abstract: | In this paper, an approach to access control in wireless power transfer (WPT) systems via frequencyselective architecture is proposed. We perform modeling of planar square loop resonance behavior in GHz range using Ansys HFSS®. Power transfer efficiency is found from the accepted power and radiated power. Using a multi-coil design, where the transmitter and receiver switch between coils of different resonance frequencies in sync, can provide for effective access control. |
| Author(s): | X. Zhou, D. Garmatyuk |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1341 KB |
| Title: | Effects of the Human Body on Wearable Wireless Power Transfer Systems |
| Abstract: | In this paper, the effects of different parts of the human body on a wearable Wireless Power Transfer (WPT) system are examined. A Strongly Coupled Magnetic Resonators (SCMR) WPT system operating in the ISM band 40.68 MHz is used in this study. The results show that when the WPT system is placed directly on the human body its Power Transfer Efficiency (PTE) is reduced by 13% on average in both simulations and measurements. These losses are attributed to the material properties of the human body. Also, different parts of the human body cause different drops in PTE due to their different shapes and geometries. |
| Author(s): | G. Perez-Greco, J. Barreto, A.-S. Kaddour, S. V. Georgakopoulos |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 11 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1384 KB |